Bearing puller having grippers parallel to a screw element



March 22, 1966 o. B. ANDERSON BEARING FULLER HAVING GRIPPERS PARALLEL TO A SCREW ELEMENT Filed April 10, 1964 OLIVER a. A/VDERJO/V av M FIG. 4.

ATTORNEYS United States Patent 3,241,223 BEARING PULLER HAVING GRIPPERS PARALLEL TO A SCREW ELEMENT Oliver B. Anderson, 1714 W. 3rd St., Grand Rapids, Minn. Filed Apr. 10, 1964, Ser. No. 358,819 1 Claim. (Cl. 29-259) This invention relates to an improvement in a tool of a special class for pulling or extracting bearings firmly seated in members having cylindrical interiors, for example for extracting internally seated bearings, bearing cups and the like and has for the primary object the provision of a device of this character which provides a durable, compact and complete tool for the above purposes and which will quickly, easily and safetly remove the part.

It is a further object to provide a bearing puller which may be used to pull bearings and the like of various diameters by means of a construction allowing the use of diiierent size jaw members which are quickly and easily interchangeable.

It will not be here attempted to set forth and indicate all of the various objects and advantages incident to the invention, but other objects and advantages will be referred to in or else will become apparent from that which follows.

The invention will appear more clearly from the following detailed description when taken in connection with the accompanying drawings, showing by way of example a preferred embodiment of the inventive idea wherein like numerals refer to like parts throughout.

In the drawings forming part of this application:

FIGURE 1 is a top plan view of the bearing puller.

FIGURE 2 is a side elevational view including a section through a bearing to be removed.

FIGURE 3 is a section on the line 33 of FIGURE 1.

FIGURE 4 is a rear end view.

FIGURE 5 is a front end view.

FIGURE 6 is a perspective view of one of the jaws removed from the device.

Referring to the drawings in detail, the bearing puller A includes the base 10 including the cylindrical body portion 12 from which extends the spaced support portions 14 and 16. The support portions 14 and 16 mount the jaw members 18 and 20 and are parallel to the longitudinal axis of the cylindrical body portion 12. The body portion 12 is formed with an axial bore 22 which is threaded for a portion thereof as at 24.

The jaw members 18 and 20 are identical, and as a result only one jaw 18 will be described in detail; however, the corresponding portions of the jaw 20 will be identically numbered but with an accompanying a. The jaw 18 includes the base end portion 26 which has formed therethrough the pin hole 28 which is normal to the longitudinal axis of the jaw. Extending from the jaw base portion 26 is the arm portion 30 which is formed with the transversely convex surface 32 extending longitudinally of the top edge thereof and the transversely concave surface 34 on the bottom thereof both of which extend longitudinally of the arm portion in parallel relation. The outer free end of the arm portion 30 of the jaw 18 terminates in the upstanding lug 36 which is normal to the longitudinal axis of the jaw and provides the stop shoulder 37. The jaw 18 is pivotally mounted between the supports 14 and 16 by means of the nut-equipped bolt 44 extending through holes formed in the supports and the hole 28 of base portion 26 of jaw 18. The jaw 20 is pivotally mounted in the same manner as jaw 18 by means of the nut-equipped bolt 46. With the jaws 18 and 20 in place as described above the concave surface 34 of jaw 18 together with the opposed concave surface of jaw 20 form a partial bore through which the reduced portion 39 of rod 38 extends. The portion 39 of rod 38 extends slightly outwardly of the shoulders 36 and 36a of the jaws 18 and 20, respectively, in position for use.

The rod 38 includes the head 40 and is threaded along an enlarged portion indicated as 42 sufficient to engage the threads 24 of the bore 22 of the body 12 in which the rod is positioned. The rod 38 is rounded slightly at the outer free end to facilitate moving the same between the jaws 18 and 20 and forcing the jaws apart when the enlarged threaded portion 42 is engaged with the threads 24 of body 12 with the portion 39 of the rod extended between the jaws 18 and 20.

In using the device A, the portion 39 of the rod 38 is withdrawn rearwardly from between the jaws 18 and 20 whereby the jaws may be pivoted together as illustrated in broken lines in FIGURE 2. This brings the outer ends of the jaws together to produce a minimum diameter of the combined ends of the jaws whereby the same may be inserted through the inner race of the bearing B. The rod 38 is then screwed forwardly whereby the outer end is extended between the jaws to separate or expand the same thereby increasing the diameter of the lugs 36. As a result the stop shoulders 37 are engageable with the inner race of the bearing B. The rod 37 is rotated so that the outer end abuts the stationary plate portion 43 of the pulley P and further rotated to thereby force the bearing B from the pulley P.

It will be seen that the size of the jaws may be increased and used with the given rod 38 whereby larger bearings may be pulled. Also, a rod such as 38 may be made smaller in diameter at 39 and thus used in conjunction with smaller jaws to use in pulling smaller bearings, for the inner diameter of the inner race governs the extent of the use of a given pair of jaws. In the various size jaws the base portion 26 remains the same for use with the base 12.

The invention is not to be understood as restricted to the details set forth since these may be modified within the scope of the appended claim without departing from the spirit and scope of the invention.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

A bearing puller comprising:

(a) a body portion having an (b) internal threaded bore,

(c) said body having a pair of spaced support portions extending therefrom normal to the longitudinal axis of said bore,

(d) a rod member threadedly engaged with and extending outwardly of said bore and said supports,

(e) a pair of jaws each having a base end and (f) a straight arm portion extending from said base end,

(g) each of said jaws pivotally connected at said base thereof to and between said support portions with the arms thereof overlying and in working contact substantially throughout its length with said rod in parallel relation thereto,

(h) each of said arm portions of each of said jaws having a stop shoulder formed thereon extending normal to the longitudinal axis thereof for engagement with an annular member,

(i) said rod adapted to extend outwardly from and between said stop shoulders for abutment with a fixed member, whereby threaded rotation of said rod causes said jaws to move relative to said rod and the fixed member.

References Cited by the Examiner UNITED STATES PATENTS FOREIGN PATENTS Germany.

EDWARD C. ALLEN, Primary Examiner.

MYRON C. KRUSE, Examiner. 

